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Osteoporosis International

Erschienen in:

01.01.2016 | Original Article

Hyponatremia and hypernatremia are associated with increased 30-day mortality in hip fracture patients

verfasst von: C. M. Madsen, C. Jantzen, J. B. Lauritzen, B. Abrahamsen, H. L. Jorgensen

Erschienen in: Osteoporosis International | Ausgabe 1/2016

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Abstract

Summary

Using data from the Danish national registries on 7317 patients, this study shows that abnormal plasma sodium levels, in the form of hyponatremia and hypernatremia, are prevalent and associated with increased 30-day mortality in hip fracture patients.

Introduction

The aim of this study was to examine the prevalence of hyponatremia and hypernatremia in patients admitted with a fractured hip as well as the association with 30-day in mortality in these patients.

Methods

A total of 7317 hip fracture patients (aged 60 years or above) with admission plasma sodium measurements were included. Data on comorbidity, medication, and death was retrieved from Danish national registries. The association between plasma sodium and mortality was examined using Cox proportional hazard models.

Results

The prevalence of hyponatremia and hypernatremia on admission was 19.0 and 1.7 %, respectively. Thirty-day mortality was increased for patients with hyponatremia (12.2 %, p = 0.005) and hypernatremia (15.5 %, p = 0.03) compared to normonatremic patients (9.6 %). After adjustment for possible confounding factors, hyponatremia (1.38 [1.16–1.64], p = 0.0003) and hypernatremia (1.71 [1.08–2.70], p = 0.02) were still associated with increased risk of death by 30 days. Looking at the association between changes in plasma sodium during admission and mortality, there was no difference between patients with normalized and persistent hyponatremia (10.4 vs 11.3 %, p = 0.6) while a lower mortality was found for normalized hypernatremia compared to persistent hypernatremia (12.4 vs 33.3 %, p = 0.03).

Conclusions

This study shows that abnormal plasma sodium levels are prevalent in patients admitted with a fractured hip and that both hyponatremia and hypernatremia are associated with increased risk of death within 30 days of admission.

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Titel: Hyponatremia and hypernatremia are associated with increased 30-day mortality in hip fracture patients
verfasst von: C. M. Madsen
C. Jantzen
J. B. Lauritzen
B. Abrahamsen
H. L. Jorgensen
Publikationsdatum: 01.01.2016
Verlag: Springer London
Erschienen in: Osteoporosis International / Ausgabe 1/2016
Print ISSN: 0937-941X
Elektronische ISSN: 1433-2965
DOI: https://doi.org/10.1007/s00198-015-3423-4

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